Unpublished in RIC and LMCC, this coin has recently been notified to me. Many thanks to Steve Thomas. Further detail of this coin and a few other new types can be found on the Hookmoor website - www.hookmoor.com

CT IMP CONSTANTINVS P F AVG Bust B2 (z) left ( 28.0 x 27.0 mm 7.06 g 6h). Shield is decorated with two captives seated back to back, trophy between. Steve Thomas collection. The detail of the shield decoration can be seen more clearly on the image below.
Attached Files